Trimming device for sewing-machines.



No. 802,790. PATENTED OCT. 24, 1905. R. G. WOODWARD.

TRIMMING DEVICE FOR SEWING MACHINES.

APPLICATION FILED FEB. 18, 1902.

2 SHEETS-SHEET 1.

PATENTED OCT. 24, 1905.

R. G. WOODWARD. TRIMMING DEVICE FOR SEWING MACHINES.

APPLICATION FILED FEB, 18, 1902.

2 SHEETS-SHEET 2.

,- 'UNTE STATES PATENT OFFICE.

UNION SPECIAL SEWING MACHINE COMPANY, OF CHICAGO, ILLINOIS,

A OORPORATIONOF ILLINOIS.

TRIIVIMING DEVICE FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented Oct. 24, 1905.

Application filed February 18, 1902. Serial No. 94,600.

1'0 (p67,. whom it may concern.

Be it known that I, RUssEL G. WOODWARD, a citizen of the United States, residing at WVaukegan, in the county of Lake, State of Illinois, have invented certain new and useful Improvements in Trimming Devices for Sewing-Machines, of which the following is a description, reference being bad to the accompanying drawings, and to the figures of reference marked thereon.

My invention relates to an improvement in trimming devices for sewing-machines, and while the present device hasbeen designed particularly for use upon the Union Special single interlock-machine, as illustrated in an application of Lansing Onderdonk and myself, filed November 9, 1901, Serial No. 81,772, it will be understood that I do not wish to be limited entirely to its application to such machine.

The invention consists in the various matters hereinafter described, and referred to in the appended claims.

In the accompanying drawings, which illustrate the invention, Figure 1 is a side elevation of my improved trimmer mechanism, illustrating so much of the sewing-machine as is necessary to a complete understanding of the invention, part being shown in section. Fig. 2 is'a plan View of Fig. 1, part being broken away. Fig. 3 is a front view, partly in section. Fig. 4 is a detail view of the upper knife-blade-supporting clamp, and Fig. 5 is a detail view of the cam-plate for moving the trimmer sidewise.

In the drawings the trimming device is shown as comprising an upper movable knife and a lower cooperating stationary knife, which two knives when brought together have a shearing action upon the goods.

Briefly, the trimmer is operated by a connecting-rod 41, embracing the ball-eccentric 42 on the driving-shaft, and at its upper end having a ball connection with the end ,of an arm 43, which at its rear end is loosely sleeved on the rock-shaft 44, supported in bearinglugs on the machine-frame. The upper trimmer-knife 45 is supported adjacent to the needle upon a second arm 46, which at its rearend is fixed to'the rock-shaft 44. The forward end of the arm, which is loosely sleeved to the rock-shaft, is provided with shoulders 47 between which passes a pin 48,

screw-threaded in a lug 49 on thetrimmerknife-supporting arm 46, said pin having on its upper end a manipulating-handle 50 and on its lower end having a head 51, adapted to engage the shoulders referred to. This pin or bolt is provided beneath the handle with a nut 7 5 to take up wear. Stops 76 are also provided for the handle. The pin is screw-threaded and so arranged that when the handle is moved to the right the pin or bolt will be screwed up slightly and the head 51 on the lower end will bear against the lower edges of the shoulders, thus securely pinning the trimmer-knife-supporting arm to the other arm 43, which is loosely sleeved on the rock-shaft 44 and to which motion is imparted from the main shaft, thus giving the up-and'down movement to the trimmer-knife. When the two arms are not pinned together, the trimmer-knife-supporting arm 46, with the rock-shaft, may be swung out of engagement with the lower knife, and as it is'swung up said arm comes in engagement with a cam or projecting plate 52, attached to a part of the trimmer-frame or on some stationary part of the machine-frame, as the cloth-plate, as shown in the aforesaid application. This forces the rock-shaft longitudinally in its bearings and keeps the trimmer-knife out of engagement with the needle-clamping collar 54. This rock-shaft is journaled in lugs 55 56, above referred to, and toward the right-hand end of the machine has an annular shoulder 57 within the enlarged or barrel portion of the lug 56, and upon its end 58 is placed a spring 59, engaging the head or shoulder 57. The barrel or enlarged part 60 of the lug 56 is screw-threaded to receive a hollow bolt 61, having a thumb-screw 62 on the end and provided also with a set-nut, so as to vary the tension of the spring 59, which keeps the rockshaft with the upper trimmer-knife normally pressed up tothe stationary trimmer-knife.

I have provided a special construction of clamp for the upper-knife blade. Pivoted vertically upon the arm 46 is a swinging clamp 64, having a kerf forming one side of a' seat for the knife-blade, a corresponding 'kerf being formed upon the opposite side of the arm 46.

A screw 65, passing through the clamp 64 into the arm 46, holds the blade firmly in position, and by loosening the clamp the knifeblade may be adjusted to proper position to take up wear and then firmly fixed for work.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a sewing-machine, a trimming mechanism including a knife with means for operating it, means for disconnecting said knife from its operating means whereby it may be raised out of action, and means independent of the trimmer and its operating mechanism for engaging the same and imparting lateral movement to the knife as it is raised.

2. In a sewing-machine, a trimming mechanism comprising a constantly-vibrating member, a knife-carrying arm with means for connecting and disconnecting said arm from the constantly-vibrating member, whereby upon disconnection the knife may be raised out of action and means engaging and imparting lateral movement to the knife-carrying arm as it is raised; substantially as described.

3. In a sewing-machine, a trimming device including a knife, with means for operating it, means for disconnecting said knife from its operating means, whereby it may be raised out of action, and means including a projection on a stationary part of the machi ne-frame, adapted to engage with said knife as it is raised, and force it away from the needle-bar.

4. In a sewing-machine, a trimming device, including upper and lower cooperating knives means for reciprocating one of said knives, means for disconnecting one of said knives from its operating means whereby it may be swung out of cooperative relation with the other knife and independent means for simultaneously moving it bodily transversely said means being independent of the trimmer and its operating means; substantially as described.

5. The herein described trimming device for sewing-machines, comprising an upper-trimmer-blade-supporting arm and means for oscillating the same, com prisinga driving-shaft, a vibrating arm eccentrically oscillated therefrom, and a pivoted catch carried by the trimmer-supporting arm and adapted when the upper trimmer-blade is moved into operative position with respect to the lower cooperating stationary blade to be turned to engage the vibrating arm and lock the vibrating arm and trimmer-blade-supporting arm together; substantially as described.

6. The herein-described trimmer for sewing-machines, comprising a rock-shaft, two forwardly-extending arms, one fixed to the rock-shaft, and the other loosely sleeved thereon, a trimmer member supported by the first arm, connections between the second arm and the driving-shaft for oscillating said second the trimmer-blade may be raised, and both arms moved laterally, to carry the knife away from the needle-bar.

7 The herein-described trimmer for sewing-machines, comprising a rock-shaft, two forwardly-extending arms one fixed to the rock-shaft, and the other loosely sleeved thereon, a trimming member supported by the first arm, connections between the second arm and the driving-shaft for oscillating said second arm, shoulders formed on said second arm, a rotatable pin or screw supported on said first arm, and having a head adapted to engage the shoulders on said second arm; substantially as described.

8. The herein-described trimmer for sewing-machines, comprising a rock-shaft, two forwardly-extending arms, one fixed to the rock-shaft, and the other loosely sleeved thereon, atrimming member supported by the first arm, connections between the second arm and the driving-shaft for oscillating said second arm, shoulders formed on said second arm, a rotatable pin or screw supported on said first arm, and havinga head adapted to engage the shoulders on said first arm, and a nut on said rotatable pin, to take up the wear; substantially as described.

9. In a trimming device, an arm provided with a suitable recess to receive the knifeblade, a plate hinged to said arm and having a vertical recess to engage one edge of said blade, with means for securing the plate; substantially as described.

10. Atrimming device for sewing-machines, comprising a rock-shaft, two forwardly-ex tending arms, one fixed to the rock-shaft and the other loosely sleeved thereon, the fixed arm having a shoulder projecting out over the loosely-sleeved arm, and means mounted thereon to unite the two arms, whereby movement is imparted to the knife-blade; substantially as described.

11. The herein-described trimmer for sewing-machines, comprising a rock-shaft, two forwardly-extending arms, one fixed to the rock-shaft and the other loosely sleeved thereon, a trimming member supported by the first arm, connections between the second arm and the driving-shaft for oscillating said second arm, shoulders formed on said second arm, a rotatable pin or screw supported on said first arm and having a head adapted to engage the shoulders on said first arm, said rotatable pin or screw being supported on a projection of the knife-carrying bar, the opening in the projection which carries the rotatable pin or screw being normally in the same vertical plane as the opening between the shoulders on the loosely-sleeved arm; substantially as described.

12. The herein-described trimmer for sewing-machines, comprising a rock-shaft, two forwardly-extending arms, one fixed to the rock-shaft and the other loosely sleeved there- IIO on, a trimming member supported by the first I arm, connections between the second arm and the driving-shaft for oscillating said second arm, shoulders formed on said second arm, a rotatable pin or screw supported on said first arm and having a head adapted to engage the shoulders on said second arm, a manipulatinghandle secured upon said pin or screw, and l stops for limiting the movement of said han dle; substantially as described. IO

In testimony whereof I afiix my signature in presence of two witnesses.

RUSSEL G. WOODVVARD. Witnesses:

CHESTER MCNEIL, JULIUS SHIRE. 

